Gas turbine plant



March 2, 1943. w. TRAUPEI.

GAS TURBINE PLANT 2 sheds-sheet 1 Filed Dec. 9, 1939 M er# e6 g BY HMM L ATTORNEYS March 2, 1943. w, TRAUPEL 2,312,605

GAS TURBINE PLANT Filed Dec. 9, 1959 2 Sheets-Sheet 2 lNvsNToR /I/aZze/ Way/ae! NM falen-44...

ATTORNEYS Patented Mar. 2, 1943 STATES GAS TINE PLANT Walter Traupel, Winterthur, Switzerland, assign or to Sulzer Frres, Socit Anonyme, Winterthur, Switzerland Application December 9, 1939,- Serial No. 308,409 In Switzerland December 24, 1938 s clams. (c1. en -41) l The invention relates to a gas turbine plant with at least two compressors arranged in series and driven by turbines, at least one of the turbines having adjustable guide blades; the invention consists in that the exhaust gases from the turbine delivering power outside the plant are used to Work a turbine that drives a precompressor, and the output of this turbine is adjusted according to the different service requirements by means of rotatable guide blades.

Adjustable guide blades have already been proposed for turbines, particularly for hydraulic turbines, but also for gas turbines. In these known turbines, however, the purpose of the adjustable blades is only to alter the cross-sectional area of flow and thereby the volume ow` ing through per second. The energy drop available in one stage is, however, not changed, and to a. certain extent neither is the direction of llow of the gases changed.

Through this invention, however, the weight of exhaust gases flowing through the guide blades per second is changed in a manner contrary to that adopted in known turbines. If, for example, the guide-wheel cross-section is diminished, the pressure before the guide wheel increases, since the whole quantity of gas dealt with in the plant must flow through in spite of the diminished cross-section of flow. Accordingly the heat drop becomes greater, and thereby also the output of the turbine. The speed of the turbine increases in accordance, so that the precompressor delivers a greater quantity of air. In consequence, more air or gas is then passed through the whole plant and the output is increased.

In addition, according to the invention there is also the advantage that the change of angle, which is connected with the reduction or increase of the cross-section of flow by adjusting the guide wheel, takes place in the correct sense, so

,that no knocking action occurs on the runner blades with the changed speed of iiow of the gases, since the velocity diagrams are altered in corresponding sense.

The adjustable guide blades are preferably designed and arranged in such a way that the gas ows through them in radial direction. Between the adjustable guide blades and the following runner blades the gas stream may be f diverted in such a way that thegas ows through the runner blades in axial direction.

An example of construction according to the invention is illustrated diagrammatically and in a simplified manner in the drawings.

Fig. 1 shows a gas turbine plant diagrammatically.

, Fig. 2 illustrates a construction of the turbine that drives the precompressor.

Figs. 3, 4 and 5 show various details of the turbine in Fig. 2.

By the precompressor I (Fig. 1) air is drawn in and delivered in a precompressed state to the cooler 2. A multi-stage main compressor 3 compresses the air further, with intermediate cooling in the intermediate cooler 4, and then delivers it into the recuperator 5. In the heater 6 the air is further heated by means of the combustion of fuel. The power gas thus obtained enters a first turbine 'I which drives the main compressor 3. After issuing from the first turbine 1 the power gases are further heated in a heater 8 by direct combustion of fuel. The power gases then iiow into the main turbine 9 that gives up power from the plant, for example by driving the electric generator I0. The exhaust gases pass through the recuperator 5 into the exhaustgas turbine I2 which is fitted with adjustable guide blades II; from there the gases are ex hausted to atmosphere.

The auxiliary turbine I2 (Fig. 2), the precompressor I and the main compressor 3 are united to form one block. From the suction'space I3 the precompressor I withdraws air and delivers it through passage I4, a cooler (not shown) and passage Ia to the maincompressor 3. From the delivery space 'la of the main compressor, the air passes into the recuperator 5- and from there into the further non-illustrated part of the gas turbine plant. After expanding in this part (not shown in the drawings) the power gases ilow again into the recuperator 5 and then through pipe I5 to turbine I2 and leave the latter through the passage I6.

The bearings I'I, I8, I9 and 20 are located within the block, since the air or the power gas in it is still at low temperatures. .The bearings are thereby not unduly heated. In addition, special cooling jackets 2| are also provided in order to prevent any impermissible increase of the temperatures.

In the pipe I5 a burner 22 is also provided, which has a fuel nozzle 23 and an ignition device 24. The purpose of this burner is, when load is suddenly increased, to increase temporarily the temperature of the power gas before the inlet into the auxiliary turbine to such an extent that by quickly increasing the speed of the auxiliary turbine the output of the Whole plant can be suited in the shortest possible time to the increased service requirements. The burner 22 v remains only quite a short time in operation until the desired increase in output has been reached; it is then immediately shut down.. The machine runs no risk of being damaged by too high temperatures.

The adjustable guide blades Il (Fig. 2) may be designed as shown in Fig. 3. Each guide blade has a shaft 25, the axis of which is parallel to the axis of the turbine. At one end of the shaft a lever 21 is fixed by the key 2i. The pin 2l is in connection with an adjusting member 2l. The bearings Il are surrounded b y cooling jackets 2l, through which a cooling medium flows. Between the coolingrjacket Il and the casing 32 of the turbine `a layer Il of heat insulating material is inserted; this prevents heat passing from the casing to the bearing. Between the bearing ll and a collar 3l on the blade shaft, a thrust member 3l is fitted. At the oppositel end of the shaft a ball bearing 26 and springs 31 are inserted, so that when the collar 34 rests on the thrust member 3l the axial position of the blade is determined. v

The bearing. 3l may be' designed as a plain bearing or, for instance, also as a roller bearing. 'I'he levers 21 (Fig..4), which belong to one half of the setof guide blades, are all arranged parallel to each other and are connected to an adjusting member 29 insuch a way that all blades are turned through the same angle. The twov adjusting members 2l are connected by means of the links 3l to a lever 39, which is in turn connected by the rod Il to the servo-motor I I l Two ofthe levers 21 are directly pivoted in the adjusting members 29. The other levers are not supported direct .in the adjusting members 29, but, as shown in Fig. 5, are at rst held in a sliding block l2, which slides in a slot In this way any jamming of the adjusting device or a non-uniform settingof the turbine blades is prevented, even when the various elements expand unequally under the influence of heat, and particularly when loads are varying.

I claim:

1. A gas turbine plant which comprises an exhaust gas turbine having adjustable guide blades,

a precompressor driven by the exhaust gas turt bine, a first turbine, a main` compressor driven by the first turbine, a main turbine arranged to drive a power means, a cooler, conduit connecting the cooler'to the precompressor and the main compressor, whereby the compressed air is cooled before it entersthe main compressor, an intermediate cooler connected by conduit to the main compressor whereby the compressed air may be cooled in an intermediate stage, a recuperator, a heater; conduit connecting the delivery end of the main compressor with the recuperator, the heater and the first turbine, whereby the air is heated in the recuperator, fur- 5 ther heated in the heater and then passed into the first turbine, a second heater connected by conduit to the exhaust side of the first turbine and to the intake side of the main turbine, a single conduit connecting the exhaust side of the main turbine with the recuperator and with the intake sideof the exhaust gas turbine, whereby all the exhaust gas from the main turbine passes through the recuperator and over the laidiustable guide blades of the exhaust gas tur- 2. A gas turbine plant which comprises a main compressor, means for driving the main compressor, a fuel burner, means for passing gas fromthe main compressor to the fuel burner to burn the fuel, thereby increasing the energy of the gas, a main turbine, conduit for passing gas from the fuel burner to the main turbine, said main turbine being arranged to drive a power machine, an exhaust gas turbine, conduit means 25 for passing all the gas from the main turbine to -the exhaust gas turbine, a plurality of rotatably adjustable guide blades arranged to guide the gas entering Vthe exhaust gas turbine, single means for adjusting a plurality of the guide blades simultaneously, a precompressor arranged to supply air under pressure to the main compressor, and means for driving the precompressor by the exhaust gas turbine.

3. A gas turbine plant which comprises an exhaust gas turbine with adjustable guide blades, a precompressor driven by the exhaust gas turbine, a main compressor, a first turbine for driving the main compressor, a main turbine for delivering power voutside the plant, a connecting conduit between the precompressor and main compressor, a recuperator and at least one heater, conduit connecting the delivery branch of the main compressor, the recuperator, the heater and the first and main turbines together in such a way that the air supplied'by the main compressor is first preheatedA in the recuperator, is then heated in the heater, and then passes in series into the first and main turbines; conduit connecting the exhaustgas branch of the main turbine, the recuperator and the intake opening of the exhaust gas turbine with each other in such a way that all the exhaust gas from the main turbine `iirst flows through the recuperator, where it gives up a part of its heat to the air supplied by the main compressor, and is then led to the exhaust gas turbine. 

